Configure Symfony 3rd party bundle with container parameters declared in custom container extension / compiler pass

Question

I want to configure the Doctrine bundle to have a DBAL connection. For some reason the configuration needs a bit of logic to retrieve. I tried to use a container extension and then a compiler pass to execute the logic while the container is compiled and store the configuration as container parameters.

During my attempts, I registered the extension and compiler pass like this in the Kernel class:

protected function build(ContainerBuilder $container)
{
    // Those lines weren't there at the same time
    $container->registerExtension(new MyCustomExtension());
    $container->addCompilerPass(new MyCustomCompilerPass());
}

It seemed to work well as I could see my parameters in the console:

 # ./bin/console debug:container --parameters

Symfony Container Parameters
============================

 ------------------------------------------------------------- ------------------------------------------------------------------------ 
  Parameter                                                     Value                                                                   
 ------------------------------------------------------------- ------------------------------------------------------------------------ 
 ...
 some.prefix.host                                              some-mariadb-host
 some.prefix.dbname                                            some-database-name
 ...

The problem is that when I try to use those parameters in my config/packages/doctrine.yaml I get an error on my next console command:

doctrine:
    dbal:
        driver: pdo_mysql
        host: '%some.prefix.host%'
        dbname: '%some.prefix.dbname%'
        # ...

# ./bin/console debug:container --parameters

In ParameterBag.php line 98:
                                                                                
  You have requested a non-existent parameter "some.prefix.host".  
                                                                                

I am using Symfony 5.3 and Doctrine bundle 2.4.

• Why do my parameters seem inaccessible for 3rd party bundle configuration ?
• How can I make this work ?
• Is there a better way to achieve this ?

Answer 1

I think the Doctrine bundle configuration gets processed before my compiler pass can declare the parameters. It probably can't be solved using the DependencyInjection component.

Solved it by importing a PHP configuration file in the services.yaml:

imports:
    - { resource: my_custom_file.php }

With the following content:

use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;

return function(ContainerConfigurator $configurator) {
    // My specific logic

    // Saving the configuration as parameters
    $configurator->parameters()->set('some.prefix.host', $host);
    $configurator->parameters()->set('some.prefix.dbname', $dbname);
    // ...
};